Epson LX-300 用户手册
Serial interface specifications
The serial interface has the following characteristics.
Bit rate:
300, 600, 1200, 2400, 4800, 9600, 19200 bps
(selectable)
(selectable)
Word length:
Data format
7 or 8-bit (selectable)
Start bit
1 bit
Parity bit
0 or 1 bit (selectable)
Stop bit
1 bit (transmitting), 1 bit or more (receiving)
Synchronization:
Asynchronous
Handshaking:
DTR protocol, XON/XOFF protocol
ETX/ACK protocol (selectable)
ETX/ACK protocol (selectable)
Parity check:
Odd, even, or no parity bit (selectable)
Connector:
EIA standard, 25-pin, D-SUB, female
connector
connector
Serial pin assignments
The following table lists the serial connector pin assignments and
describes their respective interface signals.
describes their respective interface signals.
Pin No.
Signal
Direction
Description
1
Protective Ground (FG)
Printer’s chassis ground
2
Transmitted data (TXD/SD)
Out
Printer has transmitted serial data
3
Received data (RXD/RD)
In
Printer has received serial data
4
Request to Send (RTS/RS)
Out
Always positive
5
Clear to Send (CTS/CS)
In
Ignored
7
Signal Ground (SG)
Return path for data control
signals
signals
11
Reverse Channel
Out
Connected to Pin 20
20
Data Terminal Ready
(DTR/ER)
(DTR/ER)
Out
Positive when the printer is ready
to accept data, and negative
when the printer is not ready
to accept data, and negative
when the printer is not ready
L
Blueberry REV.E
A5 size
Appendix
95/04/17
A-8
Appendix